Separating membrane pollution controlling and cleaning method

A technology for pollution control and separation membranes, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc.

Inactive Publication Date: 2013-09-25
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to overcome the shortcomings of the existing membrane pollution control methods, by controlling the load and deposition density of particles on the surface of the separation membr

Method used

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  • Separating membrane pollution controlling and cleaning method

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Embodiment

[0020] Embodiment: Also adopt the effluent of the secondary settling tank of a certain urban sewage treatment plant as raw water, adopt polyvinylidene fluoride hollow fiber membrane modules (0.22 micron pore size), the operating process of the membrane filtration device is the same as that of the comparative example, and the constant flux mode is adopted for operation. The volume is 50L / m2.h, and it operates in a cycle of 29 minutes of filtration and 1 minute of air-water double washing. The difference from the comparative example is that in the raw water circulation tank, diatomaceous earth (SiO 2 The particle size is 38 microns, Beijing Wancheng Yuanxing Chemical Products Co., Ltd.), and the diatomite loading per unit membrane area is 50mg / m 2 . After air-water cleaning, pass through a 200-mesh pipeline filter, filter out and collect diatomite from the discharged sewage, and return the collected diatomite to the raw water circulation tank to repeat the experiment. See the ...

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Abstract

The invention provides a separating membrane pollution controlling and cleaning method, comprising: adding particles in a filtration circulating system as a micro-filtration medium, locally implementing porous loosened sedimentary deposit on a membrane surface of a membrane assembly, and implementing active control of a sedimentary deposit structure by load capacity and deposition density of the particles on the surface of the separating membrane; and after sewage is filtrated, collecting the micro-filtering medium backing to a system for reusing. Aiming at an ultramicro filter membrane or a membrane distillation system, the method cancels pre-stage multimedium filtration, and provides a micro-medium locally-filtrating process. By multi-medium auxiliary filtration effect of particles, the method raises a dirt accepting capability of the system, delays membrane pollution, prolongs a membrane cleaning period, and is intended to solve problems that difference of initial flux of different membranes is big, balance flux is similar, and membrane usefulness cannot fully be performed. By selection of multimedium particle sizes of the particles, the method implements auxiliary filtration layer structure control, combines a chemical separating process and design of a membrane material surface pollution layer structure, and implements the membrane filtration process of high flux.

Description

technical field [0001] The invention relates to a separation membrane pollution control and cleaning method which can be used for liquid separation and purification. Background technique [0002] A prominent problem in the practical application of membrane technology is the attenuation of membrane performance caused by the intercepted and deposited pollutants on the membrane surface. How to effectively control the membrane pollution and maintain a high permeable flux of the membrane has a very important practical significance. A common cleaning method for the separation membrane is to blow compressed air into the shell of the external pressure hollow fiber membrane module, so that the separation membrane will shake and oscillate under the dual action of air bubbles and water flow, and the surface of the membrane will be shaken off or washed away. pollution deposits to achieve the purpose of cleaning the membrane. In order to control the rate of membrane fouling, it is ofte...

Claims

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Application Information

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IPC IPC(8): B01D65/02
Inventor 吕晓龙苏雪梅
Owner TIANJIN POLYTECHNIC UNIV
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